Type-writing machine.



M. W. POOL.

TYPE WRITING MACHINE.

APPLICATION FILED 1 1111.20, 1911.

Patented Oct. 8, I912.

1,040,&05.

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5 HISATTURNEY M. W. POOL.

TYPE WRITING MACHINE. APPLICATION FILED 1113.20, 1911.

1,040,405. Patented 0ct.8, 1912.

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TYPE WRITING MACHINE.

APPLICATION FILED FBB.20,1911.

Patented 0ct'.8,1912.

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HISATTDRNEY UNITED STATES ATE T oFFio MORRIS W. IPOOL, OF NEW YORK, N.Y., QSSIGNOR, BY MESNE ASSIGNMENTS, 'IO UNION TYPEWRITER COMPANY, OFJERSEY GTTY, NEW JERSEY, A CORPORATION OF'NEW JERSEY.

TYPE-WBITIN G MACHINE.

Specification of Letters Patent.

PatentcdOet.8,1912.

Application filed February 20, 1911. Serial No. 609,611.

New York, have invented certain new and useful Improvements inType-Writing Machines, of which the following is a specification.

My invention relates to ribbon mechanism for typewriting machines andits object is to provide variable ribbon throwing or vibrating mechanismin combination with improved stop mechanism for said variable ribbonthrowing mechanism.

Another object is to provide an improved construction of ribbonvibrator.

To the above and other ends my, invention consists in the features ofconstruction, combinations of devices and arrangements of parts to behereinafter described and par ticularly pointed out in the claims.

In prior constructions in which the ribbon throwing devices and the stopdevices therefor have been simultaneously varied or re-set, it has beenfound difficult in practice to assemble the parts so as to provide forthe accurate arresting of the throw-varying means both when it throws orvibrates the ribbon a short distance and when it throws it 'a greaterdistance. The difficulties Of providing stop devices which act to givecorrect and accurate results at alltimes are increased when the devicesare employed with a typewriting machine of the. shifting platen style.

It is the chief urpose of my invention to obviate the di culties andinaccuracies specified by providing in connection with the vibrating orribbon throwing devices and themeans for varying the same a plurality ofseparate stops, the one which limits thelonger'throw of the ribbon beingfixed and immovable on the partwhich supports it so that it may bearranged or as sembled in place with nicety and recision. The other stopwhich contro s the short throw of the ribbon is movable into and out ofaction concurrently with and preferably automatically by the throwvarying mechanism when it is set andre-set. It will be understood"thatwhen the shortthrow stop is in operative position it will arrest thevibrator, and its actuating means before the fixed or long-throw stop isreached; but when the movable stop is thrown out then the vibrator andthe actuating devices will when actuated move from normal position untilarrested by the fixed stop.

Furthermore, in some prior constructions of vibrator the printingportion ofthe-rib bon is apt to be thrown upward so that thetop edge,instead of remaining in a straight line between the guides at the sidesof the controlling the top'edge of the printing portion of the ribbon.

My invention will be more specifically described in connection with theaccompanying drawings wherein Figure 1 is a fragmentary verticalsectional view of a Monarch front strike t'pewriting machine embodyingone form 0 my invent1on, parts of the machine being omitted and brokenaway. Fig/Q is a fragmentary ,face view of the ribbon vibrator,

its support and the associate fixed stop.

Fig. 3 is avertical sectional view showing. the vibrating lever, part ofits actuating devices and part of the throw-varyingnnd, stop mechanisms.Fig. 4 is a fragmentary. front view partly in section showing theoperating leverand the upper part of the actuating link. .Fig. 5 is aplan view of the hand controlled devices for setting the throw-varyingmeans and changing the stops. Fig. 6 is a perspective view showing theribbon vibrator operating lever and the movable stop'devices associatedtherewith. Fig. 7 is a perspective view of a novel form of ribbonvibrator. 'Fig. 8 is a vertical sectional view seen from the rear andshowing part of ,a No. 10 Remin ton front-strike typewrit ng machine embying a modified form of my invention. Fig. 9 is a view cor responding toFig. 10 but omitting some parts and showing other parts in differentrelationships. V

Referring first to the construction shown in Figs. 1 to 7, inclusive,the'frame of the machine comprises a base 1, corner posts 2 and a topplate 3 above which is supported a platen 4. diagramnmticallyillustrated, the platen being mounted in a traveling carrier vibrator,will rise above such straight line so that the types mayeneroach fromoneribbon field on the other. Accordingly I have provided a vibrator inwhich such overthrow ,:of the ribbon is prevented bya roof or. lipextending crosswise of the vibrator and- (not shown) which is connectedby a band 5 with a spring drum 6 and controlled by escapement devicesomitted from the drawing. Type bars 7 coiiperate with the front face ofthe platen, said type bars being arranged in, a segment of a circle andeach being pivoted on a hanger 8 secured to a shiftablesupportingsegment 9. The type bars are each connected by a link 10 to asublever 11 cooperating with a fixed abutment 12' arid pivoted at 13 toa key lever 14 which is fulcrumed on a plate 15 in rear of the base andis provided with a restoring spring '21 at the rear end whereof carriesa small beveled gear 23 which is adapted to mesh with a' beveled gear 24on a driving shaft 25 which is connected to turn with the spring drumduring movements of the carriage in printlng direction by devicescomprising beveled gears 26 and 27. The driving or power shaft 25 is.adapted to be moved. back and.

forth endwise to connect the ribbon spools in alternation with thespring drum and thus feed the ribbon back and forth longitudinally. Aribbon 28 provided with longitudinalprinting fields a and b of differentcharacteristics or colors is wound on the ribbon spools 19 and midwaybetween said spools is threaded through a vibratory rib bon carrier orvibrator which comprises parallel vertical portions 29 which are joinedat their lower ends and terminatein a slotted stein-30 provided with across pin 31. The vertical portions 29 have lateral lugs 29 from whichrise wires 32. 1 The upper ends of the vertical portions are joined by atrough-like cross bar 33 best shown in.

'Fig. 7, the'cross bar in cross section resembling a shallow inverted U.The upper edge of the printing port-ion of the ribbon 28 is locatedwithin said trough-like portion of the machine.

or curved lip or ledge 33 (Fig. 3) and is prevented thereby from risingor departing from a horizontal straight line. The inner edges of thevertical portions 29 are bent to provide grooves which embrace theinwardly bent vertical portions of a plate-like support and guide 34suitably secured to the frame invention of another. The cross pin 31 isengaged by the slotted forward end of an operating lever 35 whichprojects through a slot 34 in the vibrator guide 34 and has ing the linkas when the round hole 45 embraces the The guide 34 per se is the v afulcrum pin 36 hearing in a bracket 37 secured to the under side of thetop plate 3 by a screw 38 (Fig. 6). The rear arm of the operating leverterminates in astop face 39 and between said stop face and the fulcrum36 is provided with oppositely disposed lateral studs or cross pins 40and 41 which coiiperate with an actuating link 42 pivotally connected atits lower end to an arm 43 on the universal bar 18 (Fig. 1) andbifurcated at its upper end to provide fOPiS 44. The studs may becomprised in a single pin driven through the lever. The left-hand forkas clearly shown in Fig. 4 is formed with a round hole 45 and itsright-hand fork is formed with a vertical slot 46. By swinging the link42 sidewise back and forth about its pivotal con nection, the openings45 and 46 may be caused to engage in alternation with the studs 41 and40 respectively, thus connect.- with the operating lever closely stud41,or loosely, so as to give a lost motion connection, as when the slot 46co.-

operates with the stud 40. The swinging movements, of the link 42 arecontrolled by hand operated devices compr1s1ng a hori- Zontal plate 47which, as shown in F g. 6,

is provided with a slot 48 in which the stem of the forked portion ofthe link 42 engages. The plate 47 is screwed at 49 to an angularslidable bracket or support 50 which is secured at the inner end of aslide rod 51, said slide rod bearing in lugs 52 and 53, depending fromthe top plate, the lug 53 being the right-hand bearing of the ribbondriving shaft 25. Collars 54 and 55 fixed to the slide rod 51 cotiperatewith the sides of the lug 52 to limit endwise movements of said sliderod. Such movements are controlled by devices which cooperate with avertical pin 56 secured to the outer end of the slide rod said devicescomprisinga bell crank 57 having 'a fixed pivot 58 and connected by aforwardly extending link 59 with a second bell. crank 60 having a fixedpivot 61. The bell crank 60 has a forwardly extending spring arm 62which projects through the right-hand cover plate 63 andterminates in afinger piece or ey 64. a tooth 65 which is adapted to engage 'notches66in the upper edge of the front plate 63, in order to hold the bell crank60,

and the train of mechanism connected there-- with down 'to and includingthe actuating link 42, in predetermined positions. The

lower end of the slidable support 50 is cut out at 56 to partly embracethe driving shaft 25 so as to give stability to the support. It will vbe understood that by sliding the support inand out, the forkedactuating link 42 is positioned to cotiperate with one or another of'thestuds 40 and 41, the key The spring arm is provided with 55 printingposition.

hole slot 48 permitting the link to be vibrated up and down so as totransmit movements of the universal bar to the operating lever andribbmi vibrator and ribbon during 5 printing operations. The upper edge67 of the slidable support is horizontal and is interposed in the pathof the stop face 3!) when the support 50 is slid in so as to engage theslot to with the stud 40. This engagement. because of the lost motion,will give the least extent of movement to the operating: lever and willraise the vibrator only far enough to present the upper ribbon field ato the types when the actuating link 42 is operated from the printingkeys. Said actuations of the operating lever will be limited by theengagement of the stop 2-35) with the edge (37 which thus serves as astop to limit the upward movement of the vibrator when the'uppcr r bbonfield is in use, thus preventing overthrow and onfining" the printing tothe upper ribbon lield.

Various features of the throw varying and stop m ehanism as thn-s fardescribed form in part the subject-imitter ol' the pend inn applicationof Edward I). liarney, Serial No. 332L956, tiled July 16, 1006. Thepresent construction differs from that shown in the appli 'ationaforesaid in that only one movable frame stop (37 is provided. 'hen saidstop is moved out; of action 'the path of the stop 39 is entirelyunobstructed, whereas in the prior construction when the frame stopcorrespontiling to (37 moved out of position a second frame stop ismoved into position to co-act with the operating lever. In the presentconstruction, instead of a second movable frame stop, I provide a fixedframe stop which always occupies the same 40 position but which isbrought into use only when the frame stop (37 has been movedtoinoperative position. The second frame stop in the present instance isa stud or pin 68 which is tixed to and projects rearward from theright'hand side portion of the upright vibrator guide 34 (Figs. 2 and3). The stud (38 passes rearward through and beyond a vertical slot (59'cut in the right-hand vertical portion 29 of the vibrator. Preferablythe upper end of the slot 69 rests on the stud 68 as shown in Fig. 2when the vibrator is in normal position, thus providing stop devices todetermine the arrest of the vibrator as it moves dmvnward from Thelength of the slot ()5) is such that; when the operating lever 35 andactuating link are engaged as shown in Fig. t and the (meratinglever hasbeen actuated until arrested by the engagement 60 of the stop 3f) withthe slidable frame stop 67 as shown in Fig. 3, then the vibrator willhave been moved upward and arrested before the lower aid of the slot.(3.) has reached the stop 68. In other words, the.

stop 68 and the cooperating stop formed by the lower closed end of theslot 69 will be inetlective or inoperative when the stops (37 and 39 areco-active. Suppose, hmvever, the stop 67 is moved rightward out ofoperation and concurrently the actuatiiug link is swung transversely ofthe operating lever so as to disengage from the stud l0 and to engageclosely with the stud ll through the round hole -t5. Then at printingoperation a greater extent of upward movement will be conunmiicatcd tothe operating lever 34 from the actuating link and the vibrator will beraised to prevent the lower ribbon field I) to the types. The upwardmovement of the vibrator will continue until it is arrested by theengagement: of the lower clost' l end of the slot (5!) with the stop Usand this engagement will take place before the lower edge of theprinting field b can have passed the printing point. In other words. thestops (5S and (it) will eo-act to limit the movement. of the vibrator soas to restrict the printing to the printing field 7) of the ribbon.

The principles of my invention may be employed in connection with othermachines beside the Monarch typewriter illustrated in .I igs. l to 7 andto make this clear I have, in Figs. 8 and t), illustrated my inventionas embodied in a No. 10 Remington frontstrike typewritiug machine. Asshown, said Remington machine con'iprises a. base 70, corner posts 71and a top plate 72. A platen 73 diagrammatieally illustrated is mountedon the arriagc (not shown) comprising a truck and a shil'table platformframe, the shifting movements of the platen frame being controlled bydevices which comprise a shift. bar 7-1. The printing movements of theplaten and carriage are controlled by eseapement devices (not shown)which are connected through a link 75 with a crank arm 76 on a rockshaft 77 connected by links 78 with a universal bar 79 which underliesthe key levers 80. A ribbon 8]. havingprintint, fields a and b ofdifferent clnn'acteristics is wound upon ribbon spools, one of which isshown and numbered 82, the ribbon spools being arranged beneath the topplate on shafts 83 and the ribbon being guided upward over guides 84 andinward along the front face of the platen. The ribbon spools, as iswell. understood, are adapted to be driven in alternation to feed theribbon lengthwise back and forth. Midway between the ribbon spools theribbon is threaded through slots in a ribbon vibrator 85 which iscontrolled by a. two-part operating lever, one lever part 86 beingpivotally con nccted with the vibrator, said part 86 being pivotallysupported at 87 on the other lever part 88 which has a fixed fulcrum 89.The lever part 88 isformed with a longitudinal slot 90 which receives anactuating stud 91 fixed to the top of an actuating link 92 piviii) - arm96 is secured.

oted at its lower end to a crank arm 93 on .the rock shaft 7 7. Whensaid rock shaft is rocked by the universal bar the link 92 will be drawndown and will operate the two lever parts 86 and 88 as a single lever,said single lever raising the vibrator and presenting the ribbon in thepath of the types. The lever parts 86 and 88 are maintained in properrelationship by devices comprising a lever 94 connected at one end'byt alink 95 to the lever part 80 and at the opposite end by an. arm 96 tothe shift bar 74 to which said As is well understood the constriictionis such that when the platen is shifted upward the shift bar 74 willoperate through the arm 96, lever 9a and link 95 to turn the lever part86 on its fulcrum 87 so as to correspondingly shift the vibrator andribbon with the platen. This shifting operation of the lever part 86 andthe vibrator 85 will not affect the lever part 88 which has a singlenormal position. Means are provided for switching the actuating stud 91to different points along the slot 90 so as to vary the .extent of throwimparted to the vibrator at printing operation. Said means I comprise aslotted shiftable frame 97 guided the fulcrum 89 so that by a. fixedscrew 98 and controlled at the front of the machine by devicescomprising a lever 99 pivotally connected to the tail of theshiftableframe and also to a crank arm 100 fixed to the rear end of a rock shaft101, the forward end of which is provided with a finger or key 102 bywhich the rock shaft may be turned in its hearings. to slide the shiftframe laterally toward and away from the vibrator- The shift frame isprovided with a downward extension 97 formed with a vertical slot 103 inwhich the stud 91 engages, so that said stud is shifted toward and awayfrom the fulcrum 89 by the shift frame. Vhen the stud and the shiftframe are in the position shown in Fig. 8 the vibrator will be raised atprinting operation so as to present the upper field a to the types.\Vhen the shift frame is shifted to the Figl 9 position the stud 91 willbe moved in toward at printing operation the vibrator will be 'lifted toa greater extent and will present the lower ribbon field .7) to thetypes. The construction as thus far de scribed is common to the No. 10Remington machine. My improvements contemplate the provision of ashiftable frame stop in the form of a. stud 104 projecting from theextension 97 of the shift frame'and lying in the path of a stop face 105on the lever part 88 when the shift frame is in the Fig.

. 8 position. At this time if a printing key be operated and thelink 92pulled down to operate the lever 86, 8S, and vibrator, said lever willbe arrested by the contact of the stop 105 with the stop 104 when thevibrator has been raised to present the up er field a to the type hepositive arrest 0.

the parts taking place before the field a has been lifted past'theprinting point. The result is that accidental printing on the lowerfield b will be prevented by said stops. When the shift frame 97 isshifted to the Fig. 9 position the shiftable frame stop 10.: will beshifted out of the path. of the stop f05 and the path of the operatinglever will be unobstructed.

But at this time the vibrator will be arrested when it has been liftedfar enough to present the lower field b to the types by a frame stop orstud 106 which is supported one. plate 107 screwed at 108 to the shiftframe 74. The stud or stop 106' is adapted to contact with the closedlower end of a slot 109 formed in the lower end of the vibrator 85.

The construction is such that when the shiftable frame stop 104: is inoperative position it will arrest the operating lever before said leverh'aslifted the vibrator far enough to bring the bottom of the slot 109against the stop100.

1'06 and109 will be inoperative when the stops 104C and 105 areoperative. But the shifting out of co-active relationship of the latterpair of stops will render efiective the stops 106 and 109. It will beunderstood that the stops 10a and 105 will not be affected when theplaten is shifted to change case. Further it will be understood that thestops '106 and 109 will both be shifted when the platen In otherwordsgi-t-he stop devices is shifted, but the shift of-the two mutualrelationship will not be altered, remaining the same in upper case as inlower case position. v In both described constructions, it will beobserved that two sets of stop devices are provided; that each setcooperates with the actuating mechanism of the ribbon vibrater topositively arrest the vibrator and ribbon at a predetermined point; thatone of the sets is combined with the throw changing devices so that thestops of said set are relatively movable with respect to each otherautomatically through the operation of the throw changing mechanism;that one of said relatively n'iovablc stops is a shiftablc frame stop;that the set of stops comprising the shiftable frame stop may be said tobe interposed between the stop members of the other set, since theyprevent the members of said other set from co-acting such coaction onlytaking place after the withdrawal from coactive relationship of the setcomprising the shiftable frame stop ;,and that the set for arresting thevibrator after it has received its greatest extent of movement comprisesa stop member which may be called a fixed frame stop incontradistinction from a frame stop which is shiftable into and out ofaction.

It will beobserved in the Figs. 8-9 form of my invention thefixed framestop 106 is mounted on platen shifting devices so that, a

it shifts. with the -pl'aten, bt1t-- its relationarrested by one pair orset of stops before slnp. I

the other" pair can engage, although one of said other pair is always in'the path of the other so that they will engage whenever the first orco-acting stops are withdrawn from action so as to permit furtheradvance of the operating lever.

Various changes may be made without depart'ng from my invention.

What I claim new and desire to secure by Letters Patent, is :e

1. In a typewriting machine, the combination with ribbon vibratingdevices settable at will to give a plurality of different extents ofvibration to the ribbon. of ribbon stop devices, certain of said stopdevices cooperating with said vibrating devices for each ex-,

tent of throw of the ribbon, the ribbon stops for a short throw of theribbon being interposed to prevent by their prior co-action cooperativeengagement between the ribbon stops for a longer throw.

2. In a typewriting machine, the combina- 0 tion with ribbon vibratingdevices settable at will to'give a plurality of different extents ofvibration to the ribbon, of ribbon stop devices, certain of said stopdevices cooperating with said vibrating devices for each extent of throwof the ribbon, for a short throw of the ribbon being interposed toprevent cooperation between the ribbon stops for a longer throw andbeing settable independently of the stops for the longer throw. 4

3. In a typewriting machine, the combination of a ribbon vibrator,vibrator actuating devices settable to give different extents of throwto the vibrator, and a plurality of sets of stops for arresting thevibrator, said sets being independently settable.

4. In a typewriting machine, the combination of a ribbon vibrator,vibrator actuating devices scttable to give different extents of throwto the vibrator, and a plurality of sets of stops for arresting thevibrator, each set comprising two members that co-act to limit the throwof the vibrator to one of a plurality of predetermined extents.

5. In a typcwriting machine, the combination of a ribbon vibrator,vibrator actuat- 'ingdevifces settable to give different extents" ofthrow to the vibrator, and a plurality of sets of stops for arrestingthe vibrator, each set coiiperatingfor one extent 01 throw, the membersconstituting one of said sets having at all times an unvarying normalrelationiiIn a typewriting machine, the combi the ribbon stops nation ofa ribbon vibrator, vibrator actuating, devices settable to givedifferent extents of throw to the vibrator, and a plurality of sets ofstops for arresting the vibrator, each set cooperating-for one extent ofthrow, the membersconstituting one of said sets having an unvaryingnormal relationship and the members constituting the other set having avariable normal relationship.

11 a typewriting machine, the combination of a ribbon vibrator, vibratoractuating devices settable to give different extents of throw to thevibrator, a plurality of sets of stops for arresting the vibrator, eachset cooperating for one extent of throw, and means for relatively movingthe members of one setwithout moving the members of the other set.

8.- In a typewriting machine, the combination of a ribbon vibrator,vibrator actuatin devices settable to give different extents o throw tothe vibrator, a )lurality of sets of stops for arresting the vibrator,each set eooperating for one extent of throw, and means for relativelymoving the members of one set without moving the members of a sec- -ondset, but the members of said second set being rendered effective by therelative movement between the members of the first 'set.

9. In a ty ewriting machine, the combination of a rib on vibrator,vibrator actuating devices set'table to give different extents of throwto the vibrator, a plurality of sets of stops for arresting thevibrator, each set cooperating for one extent of throw, and means forrelatively moving the members of one set to render co-active the membersof another set.

10. Ina typewriting machine, the combination of a ribbon vibrator,vibrator actuat ing devices settable togive different extents of throwto the vibrator, and a plurality of sets of'stops for arresting thevibrator, each set coti'perating 'for one extent of throw'of saidvibrator, each set comprising a frame stop and a co-acting stop on thetrain of devices operative to vibrate the ribbon.

11. In a typewriting machine, the combination of a ribbon vibrator,vibrator actuating devices settable to give different extents of throwto the vibrator, a plurality of sets of stops for arresting thevibrator, each set cooperating for one extent of throw of said vibrator,each set comprising a frame sto and a ccracting stop on the train ofdevices operative to vibrate the ribbon, and means for shifting-one onlyof said frame stops to change its normal relationship with its coactingstop, the other frame stop'having an unvarying normal relationship withits 00- acting stop.

12. In a typewriting machine, the combination with at will to give aplurality of different e2;-

ribbon vibrating devices settable' 'brating movement.

' normal relationshi operating tents of vibration to the ribbon, ofribbon, stop devices, certain of said stop devices cooperating with saidvibrating devices for each extent of throw of the ribbon, the ribbonstops for one extent of vibrating movement being settable independentlyof the stops for another and different extent of vi- 13. In atypewriting machine, the combination of a ribbon vibrator, actuatingdevices therefor, a stop on one of said actuating devices, a co-actingframe stop, a second frame stop, a stop on the vibrator co-active withsaid second frame stop, and means for rendering said sets of stopsoperative at will.

14. In a typewriting machine, the combi-' nation of a ribbon vibrator,vibrator actuating devices, key controlled means for setting saidactuating devices to give different extents of throw to the vibrator, aplurality of sets of stop devices, each set composed of two separatemembers cooperating for one extent of throw of the vibrator, andmeansfor rendering said sets of stop devices alternately co-active.

In a typewriting machine, the combination of a ribbon vibrator, vibratoractuat'- ingidevicea key controlled means for setting said actuatingdevices to give different extents of throw;to the vibrator, a pluralityof sets of stop devices, each set comprising two separate devicescooperating for one extent of throw of the vibrator, and means for"automatically rendering said sets of stop devices alternatelyco-active. a i

16. In atypewriting machine, the combination of a ribbon vibrator,vibrator actuating devices, key controlled means for setting saidactuating devices to give different extents of throwto the vib.rator,'aplurality of sets of stop devices, each set cooperating for one extentof throw of the vibrator, and means automatically operating to changethe between the members constituting one on y of said sets of stops.

17. In a typewriting machine, nation of a ribbon vibrator, vibratoractuatin devices, key controlled means for setting salo actuating.devices to give different extents of throw to the vibrator, a pluralityof separate sets of stop devices, each set co-- for one extent of throwof the vibrator, and means connected with said key controlled means formoving onaof said sets of stops into and out of co-actrve' relationship.

18. In a typewriting machine,. the combination of a ribbon vibrator,vibrator actuatthe combi-zf trolled means for moving one of said sets ofstops into and out of oo-active relationship, the normal relationshipbetween the other set of stops remaining always the same.

19. In a t-ypewriting machine, the combination of a ribbon vibrator,actuating devices therefor comprising an operating lever and anactuating link, means for shiftingsaid link to change the throw impartedto the vibrator, a stop coiipera-tive with said lever and controlled bysaid means, and a stop immovable by said means but rendered operativethereby.

20. In a typewriting machine, the combination of a ribbon vibrator,actuating devices therefor comprising an operating lever and anactuating link, means including a hand controlled shift frame forshifting said link to change the throw imparted to the vibrator, a stopon said shift frame coI-iperative with the stop on said operating.lever, and a relatively fixedstop cooperativewith said vibrator, saidrelatively fixed stop coming into play when the stop on said shift frameis moved out of use.

21. In a typewri'ting machine, the eombination of a shiftable platen,ribbon actuating means for a ribbon which shifts with said platen, meansfor varying said actuating means to change ribbon, and stopdevicescooperative to arrest the ribbon at the end of different extents ofthrow, certain of said stop devices being shiftable with the platen.

22. In a typewriting machine, the combination of a'shiftable platen,ribbon actuating means for a ribbon which shifts with said platen, meansfor varying said actuating means to change the throw imparted to theribbon, and sets of stop devices, each set comprising two memberscooperative to limit one extent of throw of the ribbon, the stop membersof one of said sets being shiftable with the platen.

23. In a typewriting machine, the combination of a shiftable platen,ribbon actuating means for a ribbon which shifts W'Pth said platen,means for varying said actuating means to change the throw imparted tothe ribbon, sets of stop devices, each set comprising two memberscooperative to limit one extent of throw of the ribbon, tlge stopmembers of one of said sets being shiftable with the platen, and thestop members of anofther set being independent of the platen shi t.

24. In a typeWrit-ing machine, the combination of a shiftable platen,ribbon actuating means for a ribbon which shifts with said platen. meansfor varying said actuating means to chan e the throw imparted to theribbon. sets orptop devices, each set, c on prising two memberscooperative to l mit one extent of throw of the ribbon. the stop anotherset being independent of the platen ribbon, sets of stop devices,

members of one of said sets being shiftable with the platen and the stopmembers, of another set being independent of the platen shift, and meansfor changing the normal relationship between the members of the lastnamed set of stops.

25. In a typewriting machine, the combination of a shiftable platen,ribbon actuating means for a ribbon which shifts with said platen, meansfor varying said actuating means to change the throiv imparted to theeach set comprising two members coiiperative to limit one extent ofthrow. of the ribbon, the stop members of one of said sets beingshifthble with the platen and the stop members of shift, and means forchanging the normal relationship between the members of the last namedset of stops, the stop members shit'ti .Copies of this patent may bet-btained for five cents each, by addressing the Commissioner of.I'atents,

able with the platen having an unvarying normal relationship.

26. A ribbon vibrator for typewriting machines comprising uprightparallel parts, and a roof joining said parallel parts and housing thetop edge'of the ribbon.

27. A ribbon vibrator for typewriting machines comprising. parallelparts, and a trough-like connection joining-said parallel parts attheir-tops, the upper edge portion of the ribbon being retained withinsaid trough-like connection. I I

Signed in the borough of Manhattan, city of New York, in the county ofNew York, and State of New York, this 18th day of February, A. D. 1911.

, MORRIS \V. POOL.

lVit-nesses: M. F. HANNwnnEn, E. M. WELLS.

Washington, D. G.

